"In a communication system composed of several networks and transmission systems, it is necessary for all parts of the system to be impedance matched so that medium energy transfer is possible.
One of the recent transmission systems which has been developed is the wave guide. With the advent of the wave guide the communication engineer is immediately faced with the problem of coupling existing systems and networks to his newly found mode of transmission.
Practically this coupling problem reduces to one of feeding radio frequency energy to the wave guide with some conventional transmission line such as a coaxial line. The modes and transmission characteristics of both the coaxial line and the wave guide have been thoroughly exploited in numerous texts….
....How long may the antenna become before the uniform current assumption fails? How good is the assumption even if it does give nearly correct results? It the current distribution is not uniform, does it have a pattern and is this pattern practically worth using? In short -- what is the current distribution?
With this question in mind, the project for this thesis was conceived. The project then consists of building a wave guide of considerable size, such that the current distribution on the antenna may be determined.
Such a wave guide was constructed and the current distribution was measured. Figures 8 through 13 show the measured results of this investigation. The current distribution was found in this case to be nonuniform until the antenna's effective electrical length was reduced to the order or 1/8th wave length. In the cases where the current distribution was nonuniform, the current was found to be distributed in such a way as to establish the next possible mode, even though this mode could not be transmitted by the guide. This nonuniform current distribution is assumed to be the sum of a component somewhat cosinusoidally distributed and a component which is uniform, thereby exciting the first two possible modes "--Introduction, pages 1, 3-4.
Skitek, G. G. (Gabriel G.)
Electrical and Computer Engineering
M.S. in Electrical Engineering
Missouri School of Mines and Metallurgy
iii, 58 pages
© 1956 David J. Freeman, All rights reserved.
Thesis - Open Access
Wave guides -- Mathematical models
Antennas (Electronics) -- Mathematical models
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Link to Catalog Record
Freeman, David J., "Investigation of the current distribution on an antenna in a waveguide" (1956). Masters Theses. 2199.